In this task, you're given a question, a context passage, and four options which are terms from the passage. After reading a passage, you will get a brief understanding of the terms. Your job is to determine by searching and reading further information of which term you can answer the question. Indicate your choice as 'a', 'b', 'c', or 'd'. If you think more than one option is plausible, choose the more probable option to help you answer the question.

Input: Consider Input: Question: How many songs are on the album that "Sometimes" is part of? Passage:Before recording her debut album, Spears had originally envisioned it in the style of "Sheryl Crow music, but younger [and] more adult contemporary". However, the singer agreed with her label's appointment of producers, who had the objective to reach a teen public at the time. She flew to Cheiron Studios in Stockholm, Sweden, where half of the album was recorded the spring of 1998, with producers Max Martin, Denniz Pop and Rami Yacoub, among others. "Sometimes" was written by Jörgen Elofsson, and produced by Per Magnusson and David Kreuger. Spears recorded the vocals for the song in May 1998, at Cheiron Studios in Stockholm, Sweden. It was also mixed at Cheiron Studios by Martin. Esbjörn Öhrwall played the acoustic guitar, while bass guitar was done by Thomas Lindberg. Keyboards and programming was done by Kreuger, and additional keyboards by Magnusson. Background vocals were provided by Anders von Hoffsten. Spears also co-wrote and recorded a track called "I'm So Curious", produced by Eric Foster White, that was released as a B-side to "Sometimes". The track was recorded in 1997 at 4MW East Studios in New Jersey. "Sometimes" was released as the second single from ...Baby One More Time on April 30, 1999.
 Links: a. ...Baby One More Time (album) b. A-side and B-side c. Keyboard instrument d. Sheryl Crow

Output: a


Input: Consider Input: Question: What are the names of the La Quinta Esencia hit singles? Passage:Self-titled debut album WarCry was released on April 17, 2002. Guitarists Pablo García and Fernando Mon appeared only as guest musicians on the debut album, but became full-time members on 2002 along with keyboardist Manuel Ramil and bassist Alvaro Jardón. Second album El Sello De Los Tiempos was released on December 1, 2002. At the end of 2003, Jardón left the band due to musical and personal issues. On January 1, 2004 was released the third album Alea Jacta Est striking all the music stores around Spain. On the first concert of the tour supporting the album, the band presented Roberto García, formerly of Avalanch, as Jardón's replacement. Their fourth studio album, ¿Dónde Está La Luz?, was released on February 1, 2005, considered by critics "their heaviest album to date". They embarked on a supporting tour throughout Spain. WarCry played a sold-concert in Madrid. That performance was released on February 27, 2006 as a live album, named Directo A La Luz and soon was certified gold. La Quinta Esencia was their fifth album, released on September 18, 2006 with a great acceptance by the fans and the press, taking them to the highest positions on the Spanish charts. Sixth album was set to be released on May/June, 2008, but after the lineup changes they pushed it back to September, 2008. Víctor García stated that "this album will express much duality in human beings — good and evil."
 Links: a. Alea Jacta Est b. Spain c. Spain d. La Quinta Esencia

Output: d


Input: Consider Input: Question: Which of Messner's teachers at the University of Munich was older? Passage:After Meissner’s abitur at the Humanistisches Gymnasium, in 1910, he began the study of physics and mathematics at University of Tübingen. After three terms, he went to the University of Munich as a student of the experimentalist Wilhelm Röntgen and the theoretician Arnold Sommerfeld. After one year at Munich, he returned to Tübingen to be able to study spectroscopy with Friedrich Paschen. While still a student in 1914, Meissner was able to prove the existence of oxygen lines in the solar spectrum. He was awarded his doctorate in 1915, on a thesis with the title Interferometrische Wellenlängenbestimmung im infraroten Spektralbereich. In 1916 he became an assistant to Edgar Meyer at the University of Zurich, under whom he completed his Habilitation, in 1918, with the Habilitationsschrift title Untersuchungen des Neonspektrums. The following year, he married the Polish physicist Doctor Janka Kohn.
 Links: a. Habilitation b. Ludwig Maximilian University of Munich c. University of Tübingen d. Wilhelm Röntgen


Output: d


